<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        table{
            border:  "1";
        }
        table tr{
            height: 40px;
        }
        table td{
            width: 160px;
        }

        .box{
            width: 400px;
            height: 400px;
            background-color: aquamarine;
            margin: 0 auto;

            box-shadow: 10px -10px 14px red;

        }
        body{
            text-align: center;
        }
    </style>
</head>
<body>
    <h3>box-shown</h3>
    <table>
        <tr>
            <td>h-shadown </td>
            <td>v-shadown </td>
            <td>blur</td>
            <td>color </td>
        </tr>
        <tr>
            <td>必选 水平阴影位置</td>
            <td>必选 垂直阴影位置 </td>
            <td>可选 模糊距离</td>
            <td>可选 阴影颜色 </td>
        </tr>
    </table>

    <p>
        box-shadow : h-shadown v-shadown blur color;
    </p>
    <!-- margin: 0 auto; 设置水平居中 -->
    <div class="box"></div>

</body>
</html>